JSFiddle - React, Tailwind, and code Playground

HTML

<!--
We will create a family tree using just CSS(3)
The markup will be simple nested lists
-->
<div class="tree">
	<ul>
		<li>
			<a href="#">Parent</a>
			<ul>
				<li><a href="#">Child</a>
					<ul>
						<li><a href="#">Grand Child</a></li>
					</ul>
				</li>
				<li class="three-step">
					<a href="#">Child</a>
					<ul>
						<li><a href="#">Grand Child</a></li>
						<li class="two-step"><a href="#">Grand Child</a>
							<ul>
								<li><a href="#">Great Grand Child</a></li>
								<li class="two-step"><a href="#">Great Grand Child</a></li>
							</ul>
						</li>
					</ul>
				</li>
			</ul>
		</li>
	</ul>
</div>

CSS

.tree ul {
    position: relative;
	transition: all 0.5s;
	-webkit-transition: all 0.5s;
	-moz-transition: all 0.5s;
}

.tree li {
	list-style-type: none;
    left: 5%;
	position: relative;
	padding: 10px 5px 0 5px;
	
	transition: all 0.5s;
	-webkit-transition: all 0.5s;
	-moz-transition: all 0.5s;
}

.tree li::after{
	content: '';
	position: absolute; top: 0;
	
	width: 3%; height: 50px;
	right: auto; left: -2.5%;
    
    border-bottom: 1px solid #ccc;
	border-left: 1px solid #ccc;
    border-radius: 0 0 0 5px;
	-webkit-border-radius: 0 0 0 5px;
	-moz-border-radius: 0 0 0 5px;
}
.tree li.two-step::after{
    top: -100px;
    height: 150px;
}

.tree li.three-step::after{
    top: -180px;
    height: 230px;
}
.tree li a{
	border: 1px solid #ccc;
	padding: 5px 10px;
	text-decoration: none;
	color: #666;
	font-family: arial, verdana, tahoma;
	font-size: 11px;
	display: inline-block;
    width: 180px; height: 90px;
	
	border-radius: 5px;
	-webkit-border-radius: 5px;
	-moz-border-radius: 5px;
	
	transition: all 0.5s;
	-webkit-transition: all 0.5s;
	-moz-transition: all 0.5s;
}

/*Time for some hover effects*/
/*We will apply the hover effect the the lineage of the element also*/
.tree li a:hover, .tree li a:hover+ul li a {
	background: #c8e4f8; color: #000; border: 1px solid #94a0b4;
}
/*Connector styles on hover*/
.tree li a:hover+ul li::after, 
.tree li a:hover+ul li::before, 
.tree li a:hover+ul::before, 
.tree li a:hover+ul ul::before{
	border-color:  #94a0b4;
}